Add an attachment

POST/v1/attachments

Records an attachment whose bytes are already stored under their SHA-256 (the Blob port locally, an upload URL when hosted). Several attachments may share the same bytes.

docs:writeUndoable

Request

curl -X POST "https://api.lydie.co/v1/attachments" \
  -H "Authorization: Bearer $LYDIE_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
    "workspaceId": "01JCQ3TZ0WJ8K4M2X7T9R6N1PA",
    "filename": "string",
    "contentType": "string",
    "size": 0,
    "sha256": "string"
  }'

Body

workspaceIdstringrequired· 1–64 chars
idULID
Client-minted id. Generated when omitted.
documentIdULIDor null
Default null
filenamestringrequired· 1–255 chars
contentTypestringrequired· 1–255 chars
sizeintegerrequired
sha256stringrequired

Response

idULID
workspaceIdstring· 1–64 chars
documentIdULIDor null
The document it belongs to; null for workspace files.
filenamestring· 1–255 chars
contentTypestring· 1–255 chars
sizeinteger
sha256string
createdAttimestamp
updatedAttimestamp
deletedAttimestampor null
createdBystringor nulloptional· ≥ 1 chars
updatedBystringor nulloptional· ≥ 1 chars

200

{
  "id": "01JCQ3V5MZ8G4ZK2X7T9R6N1PB",
  "workspaceId": "01JCQ3TZ0WJ8K4M2X7T9R6N1PA",
  "documentId": null,
  "filename": "string",
  "contentType": "string",
  "size": 0,
  "sha256": "string",
  "createdAt": "2026-11-12T09:30:00.000Z",
  "updatedAt": "2026-11-12T09:30:00.000Z",
  "deletedAt": null,
  "createdBy": null,
  "updatedBy": null
}

Errors use one envelope for every endpoint. See Errors and versions.